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 (
    94016, 94017, 94018, 94019, 94020, 94021, 
    94022, 94080, 94081, 94082, 94083, 
    94084, 94085, 94086, 94087, 94088, 
    94089, 94090, 94091, 94092, 94093, 
    94094, 94095, 94096, 94097, 94098, 
    94099, 94100, 94101, 94102, 94103, 
    94104, 94105, 94106, 94107, 94108, 
    94109, 94110, 94111, 94112, 94113, 
    94114, 94115, 94116, 94117, 94118, 
    94165, 94166, 94167, 94168, 94169, 
    94170, 94171, 94172, 94173, 94174, 
    94175, 94176, 94177, 94178, 94179, 
    94180, 94181, 94182, 94183, 94184, 
    94185, 94186, 94187, 94188, 94189, 
    94190, 94191, 94192, 94193, 94194, 
    94195, 94196, 94197, 94198, 94199, 
    94200, 94201, 94202, 94203, 94204, 
    94205, 94206, 94207, 94208, 94209, 
    94210, 94211, 94212, 94213, 94214
  )

Query time 0.00051

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 (94016,94017,94018,94019,94020,94021,94022,94080,94081,94082,94083,94084,94085,94086,94087,94088,94089,94090,94091,94092,94093,94094,94095,94096,94097,94098,94099,94100,94101,94102,94103,94104,94105,94106,94107,94108,94109,94110,94111,94112,94113,94114,94115,94116,94117,94118,94165,94166,94167,94168,94169,94170,94171,94172,94173,94174,94175,94176,94177,94178,94179,94180,94181,94182,94183,94184,94185,94186,94187,94188,94189,94190,94191,94192,94193,94194,94195,94196,94197,94198,94199,94200,94201,94202,94203,94204,94205,94206,94207,94208,94209,94210,94211,94212,94213,94214))",
          "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"
          ]
        }
      }
    ]
  }
}