SELECT 
  cscart_products.*, 
  cscart_products.ebay_status, 
  cscart_products.ebay_template_id 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10006, 10007, 10008, 10009, 10010, 10012, 
    10013, 10015, 10021, 10027, 10038, 
    10039, 10040, 10041, 10052, 10053
  )

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 16,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (10006,10007,10008,10009,10010,10012,10013,10015,10021,10027,10038,10039,10040,10041,10052,10053)"
    }
  }
}