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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c61e25e4ace3b06a06ed5d517ced7b330f350963e9b55755a22bb6cae2a99fb' 
  AND token = 'V59XuoW87ZffjiRzd2RZXqAHk2fKE3EccZn6VvKJtck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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