SELECT 
  product_id, 
  feature_id, 
  variant_id 
FROM 
  cscart_product_features_values 
WHERE 
  product_id IN (
    34053, 34054, 34056, 34057, 34059, 34060, 
    34062, 34063, 34065, 34066, 34068, 
    34069, 34071, 34072, 34074, 34075, 
    34076, 34077, 34079, 34080, 34082, 
    34083, 34085, 34086, 34088, 34089, 
    34091, 34092, 34094, 34095, 34097, 
    34098, 34100, 34101
  ) 
  AND feature_id IN (23512, 23513) 
  AND lang_code = 'vi'

Query time 0.00998

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": 68,
          "filtered": 100,
          "attached_condition": "cscart_product_features_values.product_id in (34053,34054,34056,34057,34059,34060,34062,34063,34065,34066,34068,34069,34071,34072,34074,34075,34076,34077,34079,34080,34082,34083,34085,34086,34088,34089,34091,34092,34094,34095,34097,34098,34100,34101) and cscart_product_features_values.feature_id in (23512,23513) and cscart_product_features_values.lang_code = 'vi'",
          "using_index": true
        }
      }
    ]
  }
}