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 (
    96762, 96763, 96764, 96765, 96766, 96771, 
    96772, 96775, 96776, 96777, 96985, 
    96986, 96987, 96988, 96989, 96990, 
    96991, 96992, 96993, 96994, 96995, 
    96996, 96997, 96999, 97000, 97001, 
    97002, 97003, 97004, 97005, 97006, 
    97007, 97008, 97009, 97010, 97820, 
    97821, 97829, 97830, 97831, 97832, 
    98039, 98258, 98259, 98260, 98261, 
    98262, 98263, 98264, 98265, 98274, 
    98275, 98276, 98277, 98278, 98279, 
    98280, 98281, 98282, 98283, 98284, 
    98285, 98286, 98287, 98288, 98289, 
    98290, 98291, 98292, 98293, 98294, 
    98295, 98296, 98297, 98298, 98299, 
    98300, 98301, 98302, 98303, 98304, 
    98305, 98306, 98307, 98308, 98309, 
    98310, 98311, 98312, 98313, 98314, 
    98315, 98316, 98317, 98318, 98319
  )

Query time 0.00036

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 (96762,96763,96764,96765,96766,96771,96772,96775,96776,96777,96985,96986,96987,96988,96989,96990,96991,96992,96993,96994,96995,96996,96997,96999,97000,97001,97002,97003,97004,97005,97006,97007,97008,97009,97010,97820,97821,97829,97830,97831,97832,98039,98258,98259,98260,98261,98262,98263,98264,98265,98274,98275,98276,98277,98278,98279,98280,98281,98282,98283,98284,98285,98286,98287,98288,98289,98290,98291,98292,98293,98294,98295,98296,98297,98298,98299,98300,98301,98302,98303,98304,98305,98306,98307,98308,98309,98310,98311,98312,98313,98314,98315,98316,98317,98318,98319))",
          "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"
          ]
        }
      }
    ]
  }
}