SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5333e8c570ad0d55dfe445fbdda530165affbecbc96bfb28f85a7f3b6bf3e038' 
  AND token = 'CLTtUO5F+V76UaQyugaNumelvenFS3BAkVnuqQAIhmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables