Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6edb93f9c2a2282dd960083e05bebbea212c706d469e1f5d7fe846bb3e3175' 
  AND token = 'oPZrgFOxDlDa9I8jnt41pSPoWs0Qd2ZHQHDNkMHGtTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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