SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7776fba1f89a2918edf3328baa87ab81bf8349c91fafadb0389306dc333826' 
  AND token = 'nSDtM7sEe48oH9TEAcd4+VpLt4UGwuEV661Aii9yKFs=' 
  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