Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fdcc00d239745f7858cdc33f5c7832bc1b39075feec2b819b46ca8d5288b4dc' 
  AND token = 'pOLj3/kojctyFtuXVl951/o/iwlK3h4g85xh5nM8Ono=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}