SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03817a0f31debbc9d2a0aa34df453c8e7f407e7fe1597c1dce4d08dba843f827' 
  AND token = 'iL/VTUwNm9J43+laE6tVbmCUhkFegU06L5du1L5qBuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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