SELECT 
  f.feature_id, 
  f.purpose, 
  p.product_id, 
  p.parent_product_id, 
  g.id, 
  g.code 
FROM 
  cscart_product_variation_group_features AS f 
  INNER JOIN cscart_product_variation_groups AS g ON f.group_id = g.id 
  INNER JOIN cscart_product_variation_group_products AS p ON f.group_id = p.group_id 
WHERE 
  p.product_id IN (
    91985, 91986, 91987, 91988, 91989, 91990, 
    91991, 91969, 91971, 91972, 91974, 
    91975, 86810, 90117, 82384, 82557, 
    83145, 89196, 84124, 82369, 82345, 
    82373, 82375, 90115, 83139, 91952, 
    89194, 82400, 82408, 82418, 84116, 
    84118, 89590, 83137, 89589, 82390, 
    86806, 82344, 82560, 82565, 82569, 
    82573, 82562, 82566, 82570, 91968, 
    82555, 82553, 82554, 86232, 86233, 
    82559, 82552, 82564, 82568, 82572, 
    91976, 91984, 86809, 82558, 82413, 
    86337, 86336, 92555, 92558, 92559, 
    92593, 92594, 92595, 92596, 92840, 
    92841, 92842, 92843, 93071, 93072, 
    93073, 93074, 93075, 93076, 93077, 
    93515, 93516, 93517, 93518, 93519, 
    93520, 93521, 93522, 93894, 93895, 
    94023, 94064, 94065, 94066, 94067
  )

Query time 0.00121

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.05"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "f",
          "access_type": "ALL",
          "possible_keys": [
            "idx_group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.25",
            "eval_cost": "0.10",
            "prefix_cost": "0.35",
            "data_read_per_join": "104"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "g",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "id"
          ],
          "key_length": "3",
          "ref": [
            "nuie_scalesta_net.f.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.25",
            "eval_cost": "0.10",
            "prefix_cost": "0.70",
            "data_read_per_join": "400"
          },
          "used_columns": [
            "id",
            "code"
          ]
        }
      },
      {
        "table": {
          "table_name": "p",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY",
            "idx_group_id"
          ],
          "key": "idx_group_id",
          "used_key_parts": [
            "group_id"
          ],
          "key_length": "3",
          "ref": [
            "nuie_scalesta_net.f.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "index_condition": "(`nuie_scalesta_net`.`p`.`product_id` in (91985,91986,91987,91988,91989,91990,91991,91969,91971,91972,91974,91975,86810,90117,82384,82557,83145,89196,84124,82369,82345,82373,82375,90115,83139,91952,89194,82400,82408,82418,84116,84118,89590,83137,89589,82390,86806,82344,82560,82565,82569,82573,82562,82566,82570,91968,82555,82553,82554,86232,86233,82559,82552,82564,82568,82572,91976,91984,86809,82558,82413,86337,86336,92555,92558,92559,92593,92594,92595,92596,92840,92841,92842,92843,93071,93072,93073,93074,93075,93076,93077,93515,93516,93517,93518,93519,93520,93521,93522,93894,93895,94023,94064,94065,94066,94067))",
          "cost_info": {
            "read_cost": "0.25",
            "eval_cost": "0.10",
            "prefix_cost": "1.05",
            "data_read_per_join": "16"
          },
          "used_columns": [
            "product_id",
            "parent_product_id",
            "group_id"
          ]
        }
      }
    ]
  }
}