SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8397cc857d98101a97c35aa3c0687f8188e4ee95e1568f36e27d1a5d57bf37e8' 
  AND token = 'wEAE/+YKDLheW5x0MoMma4W6BI+QNIa8JpHJrOGIRbg=' 
  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