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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60711a389c56191cad3142889a66a931febc4af4a14dff69cec993bef85ea942' 
  AND token = 'N/KK2MS7AxWKUB9uHRQ4P/xHJ11PAkxIzcc6pDlvu8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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