Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '075321ccccc0a6e4459b58292391960d303ddd9b1ba7a3f13a53b31837cc25bc' 
  AND token = '22EgCcU8HSgk4HqLOMFVgy48DbM+wIQ64tzyIog3hQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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