SELECT 
  product_id, 
  feature_id, 
  variant_id 
FROM 
  cscart_product_features_values 
WHERE 
  product_id IN (
    45449, 45448, 45447, 45446, 45359, 45450, 
    45451, 45452, 45453, 45454, 45455, 
    45456, 45457, 45458, 45459, 45460, 
    45461, 45462, 45463, 45464
  ) 
  AND feature_id IN (24606) 
  AND lang_code = 'vi'

Query time 0.00343

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": 22,
          "filtered": 90.90908813,
          "attached_condition": "cscart_product_features_values.feature_id = 24606 and cscart_product_features_values.product_id in (45449,45448,45447,45446,45359,45450,45451,45452,45453,45454,45455,45456,45457,45458,45459,45460,45461,45462,45463,45464) and cscart_product_features_values.lang_code = 'vi'",
          "using_index": true
        }
      }
    ]
  }
}