Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1939200b11c64ec320c3b136a7f2518ba0cbbfc50394661570cf1adfcf106c29' 
  AND token = 'HEdCdRKv4SsQNQArIuOBHrxoIxQzN/cV8aOmSAL30E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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