SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617481e335d73d983ca19f2091a9be26caa9915498f06b7e2983b512ec7c63a2' 
  AND token = 'GoXK7JO4qDx/r2MP4YnmjdpIDbUEJl8mc/fwb1H8sVE=' 
  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"
    }
  }
}