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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea99b4a6a1fc44e71c5a1375f74f3f703128d97282d775c38d52721e1eff7af' 
  AND token = 'wbbZSpIEU+sUo1WDJH1Q4sXjgkLIY6223YtDzg7Hz0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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