Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30bd04931c0f4fc5049a1822d3cc99f9d125cbf6ddfcad315ae2359424c1c472' 
  AND token = 'WXAfWfiMinc7Y93exJSDDXmFMQi+w5q7vDniT3MZYGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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