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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7452a9b7685e74472b492f057ca04efd479ac8a1eb9df0bb72a172ff54012f4' 
  AND token = 'NypbMlR2yhkiTVG4CM3G0l4cA90D7gMcuNS4C8wUfr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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