SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a537cdfa96b9c7ccbe4b176e9d914d4458ff93ee6869a8ca13892503a1aaa465' 
  AND token = '8ukS2B/yBzw788rRuvCGtUlJh+MPCHuZ83GIQiVS5pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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