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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd034a9c5ecc65d4444cc65f1dfc2bcff60ef7c42331f4f5366da496cd5611c93' 
  AND token = 'P6SlJ3bKy+OJi5/Zioobl6T5XHj3FF4aGTAhLM/++6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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