Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017dc0ea85fff15940866ef74ea18804d187f2086f5814204bf4b96949710ca2' 
  AND token = 'MHErUZmboyvZyhLhFQtXef1kdtPOnbMWUvoO/tg5OrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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