SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b617fd3718f35cefffe4097947c885115bc58fcad03fcd8019f9027eceee8008' 
  AND token = '0YeSEca60ibuhGq8jOxJvsVoeTmtgUcdzi+hvJE1OcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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