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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f8983769398c49013e33720902495a050cb8f3e4e42e415361e551c5b598005' 
  AND token = 'DHu4nHBotSQFMkMyaAEPVXkT0SPEe8ykKwwz+Py8b7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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