Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07209a42ec225ff01dc2e079f1346949559269113dc2fd2876bf0395370d6c5d' 
  AND token = '3G3Djhw5iGaQiGETruAu9t63YdCsqB19IADa16WVHho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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