Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8c61a654a070e4d1be5391985de0131409d626d95a55c3b13f6ec4dacc0bff3' 
  AND token = 'pJEN/WttLSFBdN3MKsGSYCVZnQas9ZFrqOWVnm/Iyyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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