Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0f8bb7d0795e34cf613b3109607ebc571822880ce3c1668a19c0c7f7a007ce' 
  AND token = '829e/VAKwY6HJwHfmitdf/smc+zddYdD4xT3Ne3Jjl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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