SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996de5bb190d7a8a720e3fec1e45fc31caae30a0962413309235bc5c3614d383' 
  AND token = 'cfNAB5ytVEUZcNWw+o9Se6Ql9Ab0buq7jtr3WA7O4C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

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