Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff947b071ef261974372dc43a35da39c740e264021b1dcfd987276b129d51a50' 
  AND token = 'kcFcSDtyGZGk9fBNXP1StR7ZBEQAkNTXE8iBQkGXmFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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