Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea5797d8b43f1d46a394a622873f556f9465f9a87aca736f4700b7cc504feee' 
  AND token = 'RFOt3r4oPrOPqazNRR9Y4JEQl6k0M6MaaCeO/s2DQ08=' 
  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"
    }
  }
}