Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6c6256a2d5e27e98d5a27da7ec577a6249107245a8d357f4b959a626314aa7' 
  AND token = 'jPmvLc1y9SUQ38grQlyMK6xllWt2XBnOlp4Xe6Z0SJ4=' 
  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"
    }
  }
}