Sandbox

SELECT 
  1 
FROM 
  cscart_aprilec_print_temp_designs 
WHERE 
  session_id = '7MWQ-O77Y-M1S6-CKWU-H7K9-12OO-UKCU-M9ZY' 
  AND product_id = 169 
  AND expires_at > 1778402643 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}