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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aafa3bfd030b88271c45ced9f8d10de7ad21e23eee5d7185d52080f2922bb30b' 
  AND token = 'Pemg0pwQNIE4qvKwGHefM9W7nug1gLnl8iXARvb6LOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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