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 (
    185415, 185391, 185376, 185375, 185380, 
    185377, 185395, 185385, 185416, 185379, 
    185392, 185393, 185386, 185422, 185378, 
    185402, 185388, 185383, 185425, 185382, 
    185400, 185394, 185403, 185387, 185381, 
    185409, 185419, 185397, 185384, 185413, 
    185429, 185424, 185411, 185423, 185421, 
    185404, 185398, 185399, 185407, 185412, 
    185405, 185414, 185418, 185396, 185427, 
    185417, 185428, 185406, 185408, 185431, 
    185389, 185390, 185401, 185426, 185432, 
    185420, 185430, 185410
  )

Query time 0.00111

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "249.51"
    },
    "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": 58,
          "rows_produced_per_join": 58,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "69.67",
            "eval_cost": "11.60",
            "prefix_cost": "81.27",
            "data_read_per_join": "928"
          },
          "used_columns": [
            "product_id",
            "parent_product_id",
            "group_id"
          ],
          "attached_condition": "(`webmarco`.`p`.`product_id` in (185415,185391,185376,185375,185380,185377,185395,185385,185416,185379,185392,185393,185386,185422,185378,185402,185388,185383,185425,185382,185400,185394,185403,185387,185381,185409,185419,185397,185384,185413,185429,185424,185411,185423,185421,185404,185398,185399,185407,185412,185405,185414,185418,185396,185427,185417,185428,185406,185408,185431,185389,185390,185401,185426,185432,185420,185430,185410))"
        }
      },
      {
        "table": {
          "table_name": "g",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "id"
          ],
          "key_length": "3",
          "ref": [
            "webmarco.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 58,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "58.00",
            "eval_cost": "11.60",
            "prefix_cost": "150.87",
            "data_read_per_join": "22K"
          },
          "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": [
            "webmarco.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 82,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "82.20",
            "eval_cost": "16.44",
            "prefix_cost": "249.51",
            "data_read_per_join": "8K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      }
    ]
  }
}