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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '385602647cae00f0eeafe0ab0b25f7ec5e8ac16d5fabc368e42c9a12860e5336' 
  AND token = 'SO9Mh9NuhgeVtgUasLJeL8LpMOx+pJSZ9txHn+PpK2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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