SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4188e87b8d99e00f9b292f08d9b56737ce4ee4487e8822a818a564555ffa5e' 
  AND token = 'c71Fbojvo290Efhdt/k6J+FqE6EvxDdYgKy2ww3OKHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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