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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '627c32539ffd859f21a731730e4401d537338b61d435e5ea5b3d48f252d68c42' 
  AND token = 'xgDrtRw3Sl9xtRV74+HEtcEG8ddDvj4bsB5XTt4e28s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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