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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df843d33b428dca6d8dec97c502ed9b8a483ccba5092f36e71275665cf7e6341' 
  AND token = 'KqMm94O96eH5/3vrSPNVpaI+GEkjj/RtFRzKebX69TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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