Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd953ff693b564b89b50c0497d6a1d98445dea76aea72074db0a130ac72ff50c1' 
  AND token = 'eJRTGfFozY8MKYol4oYcWs5p25vnMDmQEGTklBzvmFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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