SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce5ba81ed06ad9875001298dff580b3d14b8e537a67231768487305e29ac894' 
  AND token = 'ZcL9+C6QjsBo5xbVENXqIqvY0q1cOMGkrQzGJlarARQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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