SELECT 
  product_id, 
  feature_id, 
  variant_id 
FROM 
  cscart_product_features_values 
WHERE 
  product_id IN (
    36357, 36356, 36355, 36354, 36353, 36352, 
    36351, 36350, 36349, 36348, 36347, 
    36346, 36345, 36344, 36343, 36342, 
    36341, 36340, 36339, 36311, 36361, 
    36360, 36359, 36358
  ) 
  AND feature_id IN (23693, 23692) 
  AND lang_code = 'vi'

Query time 0.02233

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": "idx_product_feature_variant_id",
          "key_length": "12",
          "used_key_parts": ["product_id", "feature_id", "lang_code"],
          "rows": 48,
          "filtered": 100,
          "attached_condition": "cscart_product_features_values.product_id in (36357,36356,36355,36354,36353,36352,36351,36350,36349,36348,36347,36346,36345,36344,36343,36342,36341,36340,36339,36311,36361,36360,36359,36358) and cscart_product_features_values.feature_id in (23693,23692) and cscart_product_features_values.lang_code = 'vi'",
          "using_index": true
        }
      }
    ]
  }
}