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 (
    96723, 96725, 96728, 96752, 96767, 97011, 
    97013, 97018, 97021, 97034, 97037, 
    97041, 97044, 97047, 97050, 97052, 
    97053, 97056, 97811, 97812, 97815, 
    97835, 97836, 97839, 97989, 97990, 
    97993, 98031, 98032, 98035, 98158, 
    98160, 98162, 98164, 98166, 98168, 
    98250, 98251, 98252, 98253, 98254, 
    98255, 98256, 98257, 98687, 98689, 
    98698, 98699, 98739, 98741, 98743, 
    98745, 98747, 98749, 99571, 99572, 
    99580, 99582, 99584, 99586, 100067, 
    100069, 100072, 100152, 100153, 100156, 
    100169, 100171, 100173, 100176, 100178, 
    100180, 100321, 100323, 100326, 100605, 
    100606, 100610, 100884, 100887, 100900, 
    100903, 100907, 100910, 100913, 100916, 
    100918, 100919, 100922, 101112, 101115, 
    101121, 101124, 101130, 101133, 101514
  )

Query time 0.00064

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 (96723,96725,96728,96752,96767,97011,97013,97018,97021,97034,97037,97041,97044,97047,97050,97052,97053,97056,97811,97812,97815,97835,97836,97839,97989,97990,97993,98031,98032,98035,98158,98160,98162,98164,98166,98168,98250,98251,98252,98253,98254,98255,98256,98257,98687,98689,98698,98699,98739,98741,98743,98745,98747,98749,99571,99572,99580,99582,99584,99586,100067,100069,100072,100152,100153,100156,100169,100171,100173,100176,100178,100180,100321,100323,100326,100605,100606,100610,100884,100887,100900,100903,100907,100910,100913,100916,100918,100919,100922,101112,101115,101121,101124,101130,101133,101514))",
          "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"
          ]
        }
      }
    ]
  }
}