SELECT 
  f.feature_id, 
  f.purpose, 
  p.product_id, 
  p.parent_product_id, 
  g.id, 
  g.code 
FROM 
  q_product_variation_group_features AS f 
  INNER JOIN q_product_variation_groups AS g ON f.group_id = g.id 
  INNER JOIN q_product_variation_group_products AS p ON f.group_id = p.group_id 
WHERE 
  p.product_id IN (
    40981, 40982, 40983, 40984, 40985, 40986, 
    40987, 40988, 40989, 40990, 40991, 
    40992, 40993, 40994, 40995, 40996, 
    40997, 40998, 40999, 41000, 41001, 
    41002, 41003, 41004, 41005, 41006, 
    41007, 41008, 41009, 41010, 41011, 
    41012
  )

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "153.61"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "p",
          "access_type": "range",
          "possible_keys": [
            "PRIMARY",
            "idx_group_id"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "product_id"
          ],
          "key_length": "4",
          "rows_examined_per_scan": 32,
          "rows_produced_per_join": 32,
          "filtered": "100.00",
          "index_condition": "(`portal`.`p`.`product_id` in (40981,40982,40983,40984,40985,40986,40987,40988,40989,40990,40991,40992,40993,40994,40995,40996,40997,40998,40999,41000,41001,41002,41003,41004,41005,41006,41007,41008,41009,41010,41011,41012))",
          "cost_info": {
            "read_cost": "70.41",
            "eval_cost": "6.40",
            "prefix_cost": "76.81",
            "data_read_per_join": "512"
          },
          "used_columns": [
            "product_id",
            "parent_product_id",
            "group_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "g",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "id"
          ],
          "key_length": "4",
          "ref": [
            "portal.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 32,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "32.00",
            "eval_cost": "6.40",
            "prefix_cost": "115.21",
            "data_read_per_join": "24K"
          },
          "used_columns": [
            "id",
            "code"
          ]
        }
      },
      {
        "table": {
          "table_name": "f",
          "access_type": "ref",
          "possible_keys": [
            "idx_group_id"
          ],
          "key": "idx_group_id",
          "used_key_parts": [
            "group_id"
          ],
          "key_length": "4",
          "ref": [
            "portal.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 32,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "32.00",
            "eval_cost": "6.40",
            "prefix_cost": "153.61",
            "data_read_per_join": "3K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      }
    ]
  }
}