SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25976a41446feec1c8f75e3df4fef818cd613cb7a16a6d65125f9e2f84dfac06' 
  AND token = 'fZLgow9dldcqYlR9qJPlYphhVC4ZHZBz5rr6JIssEpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

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