SELECT 
  SQL_CALC_FOUND_ROWS products.product_id, 
  descr1.product as product, 
  companies.company as company_name, 
  products.product_type, 
  products.parent_product_id 
FROM 
  q_products as products 
  LEFT JOIN q_product_options_inventory as inventory ON inventory.product_id = products.product_id 
  LEFT JOIN q_product_descriptions as descr1 ON descr1.product_id = products.product_id 
  AND descr1.lang_code = 'en' 
  LEFT JOIN q_product_prices as prices ON prices.product_id = products.product_id 
  AND prices.lower_limit = 1 
  LEFT JOIN q_companies AS companies ON companies.company_id = products.company_id 
  INNER JOIN q_products_categories as products_categories ON products_categories.product_id = products.product_id 
  INNER JOIN q_categories ON q_categories.category_id = products_categories.category_id 
  AND (
    q_categories.usergroup_ids = '' 
    OR FIND_IN_SET(0, q_categories.usergroup_ids) 
    OR FIND_IN_SET(1, q_categories.usergroup_ids)
  ) 
  AND q_categories.status IN ('A', 'H') 
WHERE 
  1 
  AND q_categories.category_id IN (
    248, 
    249, 
    250, 
    258, 
    259, 
    265, 
    274, 
    279, 
    280, 
    285, 
    303, 
    304, 
    316, 
    324, 
    331, 
    332, 
    345, 
    353, 
    362, 
    396, 
    435, 
    436, 
    490, 
    496, 
    500, 
    506, 
    545, 
    251, 
    257, 
    260, 
    264, 
    266, 
    275, 
    281, 
    284, 
    286, 
    305, 
    317, 
    325, 
    330, 
    333, 
    344, 
    346, 
    354, 
    363, 
    397, 
    492, 
    497, 
    501, 
    507, 
    546, 
    252, 
    261, 
    267, 
    273, 
    276, 
    282, 
    287, 
    288, 
    306, 
    318, 
    326, 
    334, 
    347, 
    352, 
    355, 
    364, 
    398, 
    498, 
    502, 
    508, 
    510, 
    547, 
    253, 
    262, 
    268, 
    277, 
    278, 
    283, 
    289, 
    307, 
    319, 
    327, 
    335, 
    348, 
    356, 
    365, 
    399, 
    499, 
    503, 
    509, 
    511, 
    548, 
    254, 
    263, 
    269, 
    290, 
    302, 
    308, 
    309, 
    320, 
    328, 
    336, 
    349, 
    357, 
    391, 
    489, 
    504, 
    255, 
    270, 
    291, 
    310, 
    315, 
    321, 
    329, 
    337, 
    350, 
    361, 
    392, 
    505, 
    532, 
    256, 
    272, 
    311, 
    322, 
    323, 
    338, 
    351, 
    358, 
    393, 
    271, 
    312, 
    339, 
    359, 
    395, 
    313, 
    340, 
    433, 
    544, 
    314, 
    341, 
    434, 
    566, 
    342, 
    343, 
    459, 
    569, 
    394, 
    598, 
    484, 
    533, 
    535, 
    579, 
    595
  ) 
  AND companies.status = 'A' 
  AND products.company_id = 34 
  AND (
    CASE products.tracking WHEN 'O' THEN inventory.amount > 0 WHEN 'B' THEN products.amount > 0 ELSE 1 END
  ) 
  AND (
    products.usergroup_ids = '' 
    OR FIND_IN_SET(0, products.usergroup_ids) 
    OR FIND_IN_SET(1, products.usergroup_ids)
  ) 
  AND products.status IN ('A') 
  AND prices.usergroup_id IN (0, 0, 1) 
  AND products.company_id = 34 
  AND products.parent_product_id = 0 
GROUP BY 
  products.product_id 
ORDER BY 
  products.timestamp desc, 
  products.product_id ASC 
LIMIT 
  0, 32

Query time 0.02790

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1028.15"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": false,
        "nested_loop": [
          {
            "table": {
              "table_name": "inventory",
              "access_type": "system",
              "possible_keys": [
                "pc"
              ],
              "rows_examined_per_scan": 0,
              "rows_produced_per_join": 1,
              "filtered": "0.00",
              "const_row_not_found": true,
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "0.20",
                "prefix_cost": "0.00",
                "data_read_per_join": "976"
              },
              "used_columns": [
                "product_id",
                "amount"
              ]
            }
          },
          {
            "table": {
              "table_name": "companies",
              "access_type": "const",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "company_id"
              ],
              "key_length": "4",
              "ref": [
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 1,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "0.20",
                "prefix_cost": "0.00",
                "data_read_per_join": "5K"
              },
              "used_columns": [
                "company_id",
                "status",
                "company"
              ]
            }
          },
          {
            "table": {
              "table_name": "products_categories",
              "access_type": "range",
              "possible_keys": [
                "PRIMARY",
                "pt"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id"
              ],
              "key_length": "3",
              "rows_examined_per_scan": 1489,
              "rows_produced_per_join": 1489,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "336.01",
                "eval_cost": "297.80",
                "prefix_cost": "633.81",
                "data_read_per_join": "23K"
              },
              "used_columns": [
                "product_id",
                "category_id"
              ],
              "attached_condition": "(`portal`.`products_categories`.`category_id` in (248,249,250,258,259,265,274,279,280,285,303,304,316,324,331,332,345,353,362,396,435,436,490,496,500,506,545,251,257,260,264,266,275,281,284,286,305,317,325,330,333,344,346,354,363,397,492,497,501,507,546,252,261,267,273,276,282,287,288,306,318,326,334,347,352,355,364,398,498,502,508,510,547,253,262,268,277,278,283,289,307,319,327,335,348,356,365,399,499,503,509,511,548,254,263,269,290,302,308,309,320,328,336,349,357,391,489,504,255,270,291,310,315,321,329,337,350,361,392,505,532,256,272,311,322,323,338,351,358,393,271,312,339,359,395,313,340,433,544,314,341,434,566,342,343,459,569,394,598,484,533,535,579,595))"
            }
          },
          {
            "table": {
              "table_name": "q_categories",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "c_status",
                "p_category_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id"
              ],
              "key_length": "3",
              "ref": [
                "portal.products_categories.category_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 297,
              "filtered": "20.00",
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "59.56",
                "prefix_cost": "931.61",
                "data_read_per_join": "786K"
              },
              "used_columns": [
                "category_id",
                "usergroup_ids",
                "status"
              ],
              "attached_condition": "(((`portal`.`q_categories`.`usergroup_ids` = '') or find_in_set(0,`portal`.`q_categories`.`usergroup_ids`) or find_in_set(1,`portal`.`q_categories`.`usergroup_ids`)) and (`portal`.`q_categories`.`status` in ('A','H')))"
            }
          },
          {
            "table": {
              "table_name": "products",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "status",
                "idx_parent_product_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "portal.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 26,
              "filtered": "8.87",
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "5.28",
                "prefix_cost": "991.17",
                "data_read_per_join": "155K"
              },
              "used_columns": [
                "product_id",
                "product_type",
                "status",
                "company_id",
                "amount",
                "timestamp",
                "usergroup_ids",
                "tracking",
                "parent_product_id"
              ],
              "attached_condition": "((`portal`.`products`.`parent_product_id` = 0) and (`portal`.`products`.`company_id` = 34) and (case `portal`.`products`.`tracking` when 'O' then <cache>((NULL > 0)) when 'B' then (`portal`.`products`.`amount` > 0) else 1 end) and ((`portal`.`products`.`usergroup_ids` = '') or find_in_set(0,`portal`.`products`.`usergroup_ids`) or find_in_set(1,`portal`.`products`.`usergroup_ids`)) and (`portal`.`products`.`status` = 'A'))"
            }
          },
          {
            "table": {
              "table_name": "descr1",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "product_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id",
                "lang_code"
              ],
              "key_length": "9",
              "ref": [
                "portal.products_categories.product_id",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 26,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "5.28",
                "prefix_cost": "996.45",
                "data_read_per_join": "100K"
              },
              "used_columns": [
                "product_id",
                "lang_code",
                "product"
              ]
            }
          },
          {
            "table": {
              "table_name": "prices",
              "access_type": "ref",
              "possible_keys": [
                "usergroup",
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "key": "usergroup",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "portal.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 26,
              "filtered": "99.95",
              "using_index": true,
              "cost_info": {
                "read_cost": "26.41",
                "eval_cost": "5.28",
                "prefix_cost": "1028.15",
                "data_read_per_join": "633"
              },
              "used_columns": [
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "attached_condition": "((`portal`.`prices`.`lower_limit` = 1) and (`portal`.`prices`.`usergroup_id` in (0,0,1)))"
            }
          }
        ]
      }
    }
  }
}