SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837a89fb3022ff9a43e30b2948ffadb36ddaaae353ebed96811a993a37c8b856' 
  AND token = 't3AL4Im4Gv4daFADOEP3K3A/14f/iQ4XGVE4wQfBlG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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