SELECT 
  cscart_products.*, 
  cscart_products.ebay_status, 
  cscart_products.ebay_template_id 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    22335, 22336, 22337, 22338, 22339, 22340, 
    22341, 22342, 22343, 22344, 22345, 
    22346, 22347, 22348, 22349, 22350
  )

Query time 0.00037

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 (22335,22336,22337,22338,22339,22340,22341,22342,22343,22344,22345,22346,22347,22348,22349,22350)"
    }
  }
}