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 (
    2777, 2845, 2846, 2847, 2848, 2849, 2850, 
    2851, 2852, 2853, 2854, 2855, 2856, 
    2857, 2858, 2859, 2860, 2861, 2862, 
    2942, 2943, 2944, 2945, 2946, 2947, 
    2948, 2949, 2950, 3037, 3038, 3039, 
    3040, 3041, 3042, 3043, 3044, 3045, 
    3853, 5790, 5791, 5792, 5793, 5794, 
    5795, 5796, 5797, 5798, 6307, 6308, 
    6309, 6310, 6311, 6357, 6358, 6359, 
    6360, 6361, 6362, 6363, 6364, 6365, 
    6431, 6432, 6433, 6434, 6435, 6436, 
    6437, 6438, 6439, 6440, 6441, 6442, 
    6443, 6444, 6445, 6446, 6447, 6526, 
    6527, 6528, 6529, 6530, 6531, 6532, 
    6533, 6534, 6615, 6616, 6617, 6618, 
    6619, 6620, 6621, 6622, 2272
  )

Query time 0.00092

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "336.01"
    },
    "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": 96,
          "rows_produced_per_join": 96,
          "filtered": "100.00",
          "index_condition": "(`test2_gaseus`.`p`.`product_id` in (2777,2845,2846,2847,2848,2849,2850,2851,2852,2853,2854,2855,2856,2857,2858,2859,2860,2861,2862,2942,2943,2944,2945,2946,2947,2948,2949,2950,3037,3038,3039,3040,3041,3042,3043,3044,3045,3853,5790,5791,5792,5793,5794,5795,5796,5797,5798,6307,6308,6309,6310,6311,6357,6358,6359,6360,6361,6362,6363,6364,6365,6431,6432,6433,6434,6435,6436,6437,6438,6439,6440,6441,6442,6443,6444,6445,6446,6447,6526,6527,6528,6529,6530,6531,6532,6533,6534,6615,6616,6617,6618,6619,6620,6621,6622,2272))",
          "cost_info": {
            "read_cost": "57.61",
            "eval_cost": "9.60",
            "prefix_cost": "67.21",
            "data_read_per_join": "1K"
          },
          "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": 96,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "24.00",
            "eval_cost": "9.60",
            "prefix_cost": "100.81",
            "data_read_per_join": "37K"
          },
          "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": 672,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "168.00",
            "eval_cost": "67.20",
            "prefix_cost": "336.01",
            "data_read_per_join": "68K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      }
    ]
  }
}