Sandbox

SELECT 
  1 
FROM 
  cscart_aprilec_print_temp_designs 
WHERE 
  session_id = '19FM-8OZG-5SBL-1U19-J36Y-M1AO-4R6J-5HDG' 
  AND product_id = 161 
  AND expires_at > 1777643216 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00025

JSON explain

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