Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84443489dc366db06ac994f2f677d63b9f2d0a1d9e8c661fd4b954d817c6fe6b' 
  AND token = '1826XLvQFVPNLCNmd47fnLTJsd1cwcw5DWpVGIgRaXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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