SELECT 
  product_id, 
  feature_short_desc 
FROM 
  cscart_ab__short_desc_from_features_values 
WHERE 
  product_id IN (
    276588, 276589, 276590, 276591, 276592, 
    276593, 276594, 276595, 276596, 276597, 
    276598, 276599, 276600, 276601, 276602, 
    276603, 276604, 276605, 276606, 276607, 
    276608, 276609, 276610, 276611, 276612, 
    276613, 276614, 276615, 276616, 276617
  ) 
  AND lang_code = 'en' 
  AND storefront_id = 3

Query time 0.00227

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "13.52"
    },
    "table": {
      "table_name": "cscart_ab__short_desc_from_features_values",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "9",
      "rows_examined_per_scan": 30,
      "rows_produced_per_join": 3,
      "filtered": "10.00",
      "cost_info": {
        "read_cost": "13.22",
        "eval_cost": "0.30",
        "prefix_cost": "13.52",
        "data_read_per_join": "96"
      },
      "used_columns": [
        "product_id",
        "feature_short_desc",
        "lang_code",
        "storefront_id"
      ],
      "attached_condition": "((`s2cart`.`cscart_ab__short_desc_from_features_values`.`storefront_id` = 3) and (`s2cart`.`cscart_ab__short_desc_from_features_values`.`product_id` in (276588,276589,276590,276591,276592,276593,276594,276595,276596,276597,276598,276599,276600,276601,276602,276603,276604,276605,276606,276607,276608,276609,276610,276611,276612,276613,276614,276615,276616,276617)) and (`s2cart`.`cscart_ab__short_desc_from_features_values`.`lang_code` = 'en'))"
    }
  }
}