SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95900a6b66906bfa27067feffd5365743df2b52c2923bb00e0cee7e896ffd83' 
  AND token = '/4jaXN2M8LfmSUQobdPCafGYoZ34rjsHhKjuBt2hQ+U=' 
  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