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 (
    86524, 86800, 85124, 85125, 89075, 89076, 
    85360, 86500, 86776, 86147, 86148, 
    86170, 86171, 86663, 86664, 86732, 
    86733, 82819, 82892, 82965, 83073, 
    83626, 90909, 90988, 85083, 85169, 
    85215, 85261, 89074, 85123, 86195, 
    86218, 86527, 86803, 89079, 89080, 
    85320, 85321, 85417, 85418, 85468, 
    85469, 85519, 85520, 86184, 86185, 
    86207, 86208, 86508, 86509, 86784, 
    86785, 82855, 82856, 82928, 82929, 
    83001, 83002, 83517, 83518, 83525, 
    83526, 85366, 85367, 86146, 86169, 
    86662, 86731, 89071, 89072, 82600, 
    83076, 83629, 90912, 90991, 86638, 
    86707, 85086, 85172, 85218, 85264, 
    83057, 83058, 83606, 83607, 89825, 
    89826, 89877, 89878, 89949, 89950, 
    90893, 90894, 90972, 90973, 91515
  )

Query time 0.00033

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 (86524,86800,85124,85125,89075,89076,85360,86500,86776,86147,86148,86170,86171,86663,86664,86732,86733,82819,82892,82965,83073,83626,90909,90988,85083,85169,85215,85261,89074,85123,86195,86218,86527,86803,89079,89080,85320,85321,85417,85418,85468,85469,85519,85520,86184,86185,86207,86208,86508,86509,86784,86785,82855,82856,82928,82929,83001,83002,83517,83518,83525,83526,85366,85367,86146,86169,86662,86731,89071,89072,82600,83076,83629,90912,90991,86638,86707,85086,85172,85218,85264,83057,83058,83606,83607,89825,89826,89877,89878,89949,89950,90893,90894,90972,90973,91515))",
          "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"
          ]
        }
      }
    ]
  }
}