SELECT 
  product_id, 
  feature_id, 
  variant_id 
FROM 
  cscart_product_features_values 
WHERE 
  product_id IN (
    44995, 44943, 44986, 44987, 44988, 44989, 
    44994, 44993, 44992, 44991, 44990, 
    45008, 45007, 45006, 45005, 45004, 
    45003, 45002, 45001, 45000, 44999, 
    44998, 44997, 44996
  ) 
  AND feature_id IN (24552, 24551) 
  AND lang_code = 'vi'

Query time 0.01491

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_product_features_values",
          "access_type": "range",
          "possible_keys": [
            "PRIMARY",
            "fl",
            "lang_code",
            "product_id",
            "fpl",
            "idx_product_feature_variant_id"
          ],
          "key": "PRIMARY",
          "key_length": "6",
          "used_key_parts": ["feature_id", "product_id"],
          "rows": 95,
          "filtered": 52.63158035,
          "attached_condition": "cscart_product_features_values.product_id in (44995,44943,44986,44987,44988,44989,44994,44993,44992,44991,44990,45008,45007,45006,45005,45004,45003,45002,45001,45000,44999,44998,44997,44996) and cscart_product_features_values.feature_id in (24552,24551) and cscart_product_features_values.lang_code = 'vi'",
          "using_index": true
        }
      }
    ]
  }
}