Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67dffce6ffc63abc715205d643d7d999e59be2cabca3d9c54d62231059f8371f' 
  AND token = 'BApva5loaBaAijLYCnOIOuF96ELX8/QQKT59MxHKVtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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