SELECT 
  cscart_products.*, 
  cscart_products.ebay_status, 
  cscart_products.ebay_template_id 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    22591, 22592, 22593, 22594, 22595, 22596, 
    22597, 22598, 22599, 22600, 22601, 
    22602, 22603, 22604, 22605, 22606
  )

Query time 0.00029

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 (22591,22592,22593,22594,22595,22596,22597,22598,22599,22600,22601,22602,22603,22604,22605,22606)"
    }
  }
}