Sandbox

SELECT 
  1 
FROM 
  cscart_aprilec_print_temp_designs 
WHERE 
  session_id = '2Z9I-LJ1F-G605-4P9D-CAWR-RJJF-Z8E3-CXTE' 
  AND product_id = 156 
  AND expires_at > 1777908571 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00029

JSON explain

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