Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7727a30059d72666164ff07d2358c826d103ed49942bde6856a4d4a37d0d7178' 
  AND token = 'Yxq5Rsdttpor83UB/p47tTQ91iS2Xrp14ykkP27OQsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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