Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ffdb4cedc60d047036135d4aac8d358ba110dd491b834fef5d21aa2d80b8b17' 
  AND token = 'XgbH0RcbNg6ppF/+eKRHb4wkiCWe1Z/3ZH+QlFHVkgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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