SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178e9b7f507c87044bb29769ab186f2149ed0ac245b69f3e0440896e19c16ffb' 
  AND token = 'ZfleeiuAEzWaS+EJtQVd6j9enenzYwxxdJ1yjBDjGUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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