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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5ab8fa78afc375f1b5f4c5443e863bcd4e8ee65e05e0ac1897bb3d95d8b9b1' 
  AND token = '4K8GjR+5axq9svnRsRscLpIHLyszGgKZ7ns9SdIhhyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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