SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2920d3d177bda7d24caf9b19ac527d35b8604df707ae0a691caa289ddbe82f1b' 
  AND token = 'MHzYL7+OGRoKqVcJ03mjQXqGqk3Zp73ljEaV6yu8sZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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