SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8c991b72de3efabaa7bd2bd0d371c375d77d884ccaf3d6590d6f42588dec65' 
  AND token = '5l+NdLm/YtwMI31jayp24hqbEiPUFQVYfl5EV35tf8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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