SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c13d542540d42613cbd3e51f9eb16369f4e95dbaf86c6515398c8b7d510b21d' 
  AND token = 'd+Hi72/pOVcVk7a3C0U4aSAfI1jZSrLHUKtFioIc+rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

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