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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd679be86d7bfa78218f3163961fe2ed26afcdf844cb1ebd35d168383e730cf8e' 
  AND token = 'EhNcfdid3j5xLsetCvoI5v8X49sBQ5hdJS/VbcAtQKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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