SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32c9230fad794aaf5bef31e351cfeb39ecbe58b453ad45423a61c9383e80a73' 
  AND token = 'OX9/tR3EhwKOkzT/FmNI3+m2s5d0Cd7KvOBmz2hMjys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

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