Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577f9d82ab1af29701894a02e9a16f063ad0e378c3d8ce6d8ed38500b8365487' 
  AND token = 'YFKjgMFbiJy10rtHpsFl/x5/yytH/By/ohQsBCrP01k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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