Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70700ce3d534c72595e9cb8172d5225d136e247029ef2e85c94c97d131bdfa7' 
  AND token = 'g1+l5pr9MdO6XWf9UpJRA8o94ir2tGcyZMIjEOWsE9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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