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 (
    12, 17, 148, 180, 187, 232, 230, 231, 18, 
    16, 4, 5, 23, 24, 170, 1, 22, 149, 227, 
    78, 79, 190, 189, 162, 159, 158, 245, 
    238, 239, 242, 243, 241, 240, 214, 217, 
    218, 207, 59, 58, 60, 199, 198, 94, 96, 
    201, 114, 192, 136
  )

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "4.40"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "g",
          "access_type": "system",
          "possible_keys": [
            "PRIMARY"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.00",
            "eval_cost": "0.20",
            "prefix_cost": "0.00",
            "data_read_per_join": "400"
          },
          "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": [
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "1.00",
            "eval_cost": "0.20",
            "prefix_cost": "1.20",
            "data_read_per_join": "104"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      },
      {
        "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": [
            "const"
          ],
          "rows_examined_per_scan": 6,
          "rows_produced_per_join": 3,
          "filtered": "50.00",
          "cost_info": {
            "read_cost": "2.00",
            "eval_cost": "0.60",
            "prefix_cost": "4.40",
            "data_read_per_join": "48"
          },
          "used_columns": [
            "product_id",
            "parent_product_id",
            "group_id"
          ],
          "attached_condition": "(`danishecarter_25_march`.`p`.`product_id` in (12,17,148,180,187,232,230,231,18,16,4,5,23,24,170,1,22,149,227,78,79,190,189,162,159,158,245,238,239,242,243,241,240,214,217,218,207,59,58,60,199,198,94,96,201,114,192,136))"
        }
      }
    ]
  }
}