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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82fe3e48eb0fb0dfd576d225dd4ab4ef8fca4c17c79845d187c922ee6b6dda8f' 
  AND token = '947g6eF7dPJo9R5QQo29ocvQIGBTvPLH6ymbzuh6u8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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