SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de01556dc9d2fdcf6fa470c8ad6a9d4d3a146cc146a4104ed8c38b36b20331c' 
  AND token = 'qIZF+x1QXtHuHz0G9OTcOmExDRoX7DnW9zoukh9plB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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