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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299cce01d14dc46ddc54a26a033f486272f94d16fae4f06dcb2752814a55126e' 
  AND token = 'Y9w7mvxbodzZ2mWelp5jcrT2ZXyfWUEr39Yi/8EmI2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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