Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f524a47c606c11ad1848b3d18aa2c8a2bef966d077c3902d717d3abaeeb01e' 
  AND token = 'dfuKp2jsblLyohO48iWrPnMdtRwTn6jrQmKJNFVUpsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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