Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '421d43c13005a11a3cbb4d69d3f786ab9234d2688afc754c8bffeb85acde911a' 
  AND token = 'm0CWEx5xC1flSHqgm8vO4iNNoSAPHGisJAKedTXJO+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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