SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c18b404d2703e96099b740d2aa04cda57857e387d1555f73bf41b70380f9026' 
  AND token = 'a3b2Ib2yzXjfDUSB/OasNJo8tqVZ/J0SbSt6bYhcby8=' 
  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