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 (
    91921, 91922, 91923, 91924, 91925, 91926, 
    91927, 89440, 82416, 91913, 91914, 
    91915, 91916, 91917, 91918, 91919, 
    82415, 86854, 89438, 82398, 84262, 
    84266, 82397, 86850, 89728, 89733, 
    89158, 89549, 82334, 82339, 82349, 
    84913, 84916, 84919, 84928, 84931, 
    86390, 89436, 83086, 89122, 89161, 
    89552, 82347, 86808, 89736, 89989, 
    89990, 89991, 89992, 86811, 89098, 
    89126, 82330, 82348, 86807, 86846, 
    89732, 91292, 90094, 90104, 90113, 
    91288, 83116, 83126, 83135, 90121, 
    89200, 83143, 84122, 82447, 91284, 
    91920, 91912, 90118, 89197, 83140, 
    84119, 82364, 82363, 90117, 89196, 
    90115, 89194, 84116, 84118, 83137, 
    82390, 92842, 94078, 94686, 94690, 
    94692, 94693, 94710, 94714, 94716
  )

Query time 0.00082

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 (91921,91922,91923,91924,91925,91926,91927,89440,82416,91913,91914,91915,91916,91917,91918,91919,82415,86854,89438,82398,84262,84266,82397,86850,89728,89733,89158,89549,82334,82339,82349,84913,84916,84919,84928,84931,86390,89436,83086,89122,89161,89552,82347,86808,89736,89989,89990,89991,89992,86811,89098,89126,82330,82348,86807,86846,89732,91292,90094,90104,90113,91288,83116,83126,83135,90121,89200,83143,84122,82447,91284,91920,91912,90118,89197,83140,84119,82364,82363,90117,89196,90115,89194,84116,84118,83137,82390,92842,94078,94686,94690,94692,94693,94710,94714,94716))",
          "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"
          ]
        }
      }
    ]
  }
}