SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9bd39961c27cff44a187bd26f1ea6a50b6e4065740b5660cf6b9b0a7dc8fa3' 
  AND token = 'uOwkYgSPwaJgllzXe31hYV6D/rxOJJDvuMlIm3VCt08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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