SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6212348d11769cf8b893d94a463790547953581f1c419bbd41f846cae8fd559' 
  AND token = '2UyGBWSWiV53b/wY5WiOXPixJ2PIOH4Xm4ijDyDcNNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

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