Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb45dad45e6c292a496a1e182479f04f9bb003859b3f0ae4f8f485f2d3f14b7' 
  AND token = 'zUUgQzW/ZQT+fsFoEeMH/ZFe6VuFdH9QCdchUrbr8B0=' 
  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"
    }
  }
}