SELECT 
  q_product_filters.filter_id, 
  q_product_features_values.variant_id 
FROM 
  q_product_features_values 
  LEFT JOIN q_products as products ON products.product_id = q_product_features_values.product_id 
  LEFT JOIN q_product_filters ON q_product_filters.feature_id = q_product_features_values.feature_id 
  LEFT JOIN q_product_features ON q_product_features.feature_id = q_product_features_values.feature_id 
  LEFT JOIN q_product_options_inventory as inventory ON inventory.product_id = products.product_id 
  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 
  q_product_filters.filter_id IN (1, 3) 
  AND q_product_features_values.feature_id IN (2) 
  AND q_product_features_values.lang_code = 'en' 
  AND q_categories.category_id IN (
    6, 
    7, 
    9, 
    148, 
    160, 
    169, 
    185, 
    368, 
    407, 
    426, 
    439, 
    440, 
    441, 
    444, 
    446, 
    447, 
    455, 
    456, 
    461, 
    466, 
    477, 
    520, 
    537, 
    61, 
    62, 
    149, 
    159, 
    161, 
    170, 
    186, 
    369, 
    408, 
    427, 
    442, 
    443, 
    448, 
    462, 
    467, 
    478, 
    528, 
    538, 
    63, 
    147, 
    150, 
    162, 
    168, 
    171, 
    187, 
    370, 
    409, 
    449, 
    454, 
    463, 
    468, 
    530, 
    539, 
    64, 
    151, 
    163, 
    172, 
    184, 
    189, 
    371, 
    450, 
    460, 
    464, 
    540, 
    567, 
    65, 
    152, 
    164, 
    173, 
    292, 
    372, 
    378, 
    451, 
    476, 
    541, 
    568, 
    153, 
    165, 
    174, 
    360, 
    373, 
    411, 
    452, 
    479, 
    571, 
    154, 
    166, 
    175, 
    374, 
    406, 
    453, 
    465, 
    587, 
    155, 
    167, 
    176, 
    425, 
    482, 
    536, 
    156, 
    177, 
    438, 
    495, 
    558, 
    157, 
    445, 
    563, 
    158, 
    179, 
    519, 
    570, 
    180, 
    584, 
    596, 
    367, 
    181, 
    182, 
    619, 
    183, 
    188, 
    244, 
    481, 
    518, 
    521, 
    522, 
    529, 
    531
  ) 
  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 products.company_id = 34 
  AND q_product_features.feature_type IN ('S', 'M', 'E') 
GROUP BY 
  q_product_features_values.variant_id

Query time 0.02486

JSON explain

{
  "query_block": {
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    "cost_info": {
      "query_cost": "992.87"
    },
    "grouping_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "26.15"
      },
      "nested_loop": [
        {
          "table": {
            "table_name": "inventory",
            "access_type": "system",
            "possible_keys": [
              "pc"
            ],
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            "rows_produced_per_join": 1,
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            "used_columns": [
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          }
        },
        {
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            "used_columns": [
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          }
        },
        {
          "table": {
            "table_name": "q_product_filters",
            "access_type": "ref",
            "possible_keys": [
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            ],
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            },
            "used_columns": [
              "filter_id",
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            ],
            "attached_condition": "(`portal`.`q_product_filters`.`filter_id` in (1,3))"
          }
        },
        {
          "table": {
            "table_name": "products_categories",
            "access_type": "range",
            "possible_keys": [
              "PRIMARY",
              "pt"
            ],
            "key": "PRIMARY",
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            ],
            "key_length": "3",
            "rows_examined_per_scan": 2808,
            "rows_produced_per_join": 1404,
            "filtered": "100.00",
            "using_index": true,
            "using_join_buffer": "Block Nested Loop",
            "cost_info": {
              "read_cost": "316.39",
              "eval_cost": "280.80",
              "prefix_cost": "598.39",
              "data_read_per_join": "21K"
            },
            "used_columns": [
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            ],
            "attached_condition": "(`portal`.`products_categories`.`category_id` in (6,7,9,148,160,169,185,368,407,426,439,440,441,444,446,447,455,456,461,466,477,520,537,61,62,149,159,161,170,186,369,408,427,442,443,448,462,467,478,528,538,63,147,150,162,168,171,187,370,409,449,454,463,468,530,539,64,151,163,172,184,189,371,450,460,464,540,567,65,152,164,173,292,372,378,451,476,541,568,153,165,174,360,373,411,452,479,571,154,166,175,374,406,453,465,587,155,167,176,425,482,536,156,177,438,495,558,157,445,563,158,179,519,570,180,584,596,367,181,182,619,183,188,244,481,518,521,522,529,531))"
          }
        },
        {
          "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": 280,
            "filtered": "20.00",
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            },
            "used_columns": [
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              "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"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
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            "filtered": "9.31",
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            "used_columns": [
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              "usergroup_ids",
              "tracking"
            ],
            "attached_condition": "((`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": "q_product_features_values",
            "access_type": "ref",
            "possible_keys": [
              "PRIMARY",
              "fl",
              "variant_id",
              "lang_code",
              "product_id",
              "fpl"
            ],
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            "used_key_parts": [
              "feature_id",
              "product_id",
              "lang_code"
            ],
            "key_length": "12",
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            ],
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            },
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              "product_id",
              "variant_id",
              "lang_code"
            ]
          }
        }
      ]
    }
  }
}