Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e919661c3a0463e865ddfa7f69a85670c717ca3a8ec7f9a14e8455535dac6d' 
  AND token = 'HzmMB9YeXoKLxzg380Mrm5DxAsQr74dsjLy7c6D7AQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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