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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8241bc0a6209bb77301ecaef21e13397d5f13276a955114414acd71f44ffe1a4' 
  AND token = '5Z8F7QYXOb7Ml+Ym4t4bYw6wN0M8yjpqbHdwK7pU1J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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