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 (
    5131, 13298, 13299, 13300, 13301, 13124, 
    13125, 13126, 13127, 13098, 13105, 
    13112, 13118, 13064, 13071, 13078, 
    13085, 13091, 12464, 12624, 12654, 
    3834, 3833, 2130
  )

Query time 0.00161

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "100.26"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "p",
          "access_type": "range",
          "possible_keys": [
            "PRIMARY",
            "idx_group_id"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "product_id"
          ],
          "key_length": "3",
          "rows_examined_per_scan": 29,
          "rows_produced_per_join": 29,
          "filtered": "100.00",
          "index_condition": "(`test2_gaseus`.`p`.`product_id` in (5131,13298,13299,13300,13301,13124,13125,13126,13127,13098,13105,13112,13118,13064,13071,13078,13085,13091,12464,12624,12654,3834,3833,2130))",
          "cost_info": {
            "read_cost": "16.16",
            "eval_cost": "2.90",
            "prefix_cost": "19.06",
            "data_read_per_join": "464"
          },
          "used_columns": [
            "product_id",
            "parent_product_id",
            "group_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "g",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "id"
          ],
          "key_length": "3",
          "ref": [
            "test2_gaseus.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 29,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "7.25",
            "eval_cost": "2.90",
            "prefix_cost": "29.21",
            "data_read_per_join": "11K"
          },
          "used_columns": [
            "id",
            "code"
          ]
        }
      },
      {
        "table": {
          "table_name": "f",
          "access_type": "ref",
          "possible_keys": [
            "idx_group_id"
          ],
          "key": "idx_group_id",
          "used_key_parts": [
            "group_id"
          ],
          "key_length": "3",
          "ref": [
            "test2_gaseus.p.group_id"
          ],
          "rows_examined_per_scan": 7,
          "rows_produced_per_join": 203,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "50.75",
            "eval_cost": "20.30",
            "prefix_cost": "100.26",
            "data_read_per_join": "20K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      }
    ]
  }
}