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 (
    101401, 101402, 101403, 101404, 101405, 
    101406, 101407, 101408, 101409, 101410, 
    101411, 101412, 101413, 101414, 101415, 
    101416, 101417, 101418, 101419, 101420, 
    101421, 101422, 101423, 101424, 101425, 
    101426, 101427, 101428, 101429, 101430, 
    101431, 101432, 101433, 101434, 101435, 
    101436, 101437, 101438, 101439, 101440, 
    101441, 101442, 101443, 101444, 101445, 
    101446, 101447, 101448, 101449, 101450, 
    101451, 101452, 101453, 101454, 101455, 
    101456, 101457, 101458, 101459, 101460, 
    101461, 101462, 101463, 101464, 101465, 
    101466, 101467, 101468, 101469, 101470, 
    101471, 101472, 101473, 101474, 101475, 
    101476, 101477, 101478, 101479, 101480, 
    101481, 101482, 101483, 101484, 101485, 
    101486, 101487, 101488, 101489, 101490, 
    101491, 101492, 101493, 101494, 101495, 
    101496
  )

Query time 0.00077

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 (101401,101402,101403,101404,101405,101406,101407,101408,101409,101410,101411,101412,101413,101414,101415,101416,101417,101418,101419,101420,101421,101422,101423,101424,101425,101426,101427,101428,101429,101430,101431,101432,101433,101434,101435,101436,101437,101438,101439,101440,101441,101442,101443,101444,101445,101446,101447,101448,101449,101450,101451,101452,101453,101454,101455,101456,101457,101458,101459,101460,101461,101462,101463,101464,101465,101466,101467,101468,101469,101470,101471,101472,101473,101474,101475,101476,101477,101478,101479,101480,101481,101482,101483,101484,101485,101486,101487,101488,101489,101490,101491,101492,101493,101494,101495,101496))",
          "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"
          ]
        }
      }
    ]
  }
}